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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557c7b60caf275a78ee59d06ac10803349dc399c27bfd8ae4980f988c8a731a8' 
  AND token = 'Qe6QhpB2Iqv3FcvFXi75hm0EtdJqjw6i0HQEvGS62Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}