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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9ea3cd6f849dde3fd572abe34c85096e74a4a71c2bfab488220ab7fbd58484' 
  AND token = 'Yk97aTdwjLlu2i9ZM0uW7nt6QaLtpUGjrrCKNk7Ee8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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