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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aca15a6409dc51e1aeb32d976e802e72896aedabf4153420479c3a8c2099b63' 
  AND token = 'A8SqM+a0UKVYLLrSlapw/IopfTkEyQ/uNeRAhyD5oQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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