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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13785747f7a18de0423518cf37800f54f1cd3de6310a68bd032420d01593e4cd' 
  AND token = '303bVkZ5aobL24e90FwJ6kwWaaORtE3L6hvpxxkH+Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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