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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f033f064f4444e2cdbb32314134fe082c2a41437603b6c930471c1d68750ef91' 
  AND token = 'RIzbry0JCa4fz2NhomU5IbqeKYZE5k6T8qx1XcTjlbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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