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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0cf83895015fa9439cd6d99faa0ca244aac08dfc4c10b3360334b48b0a58e66' 
  AND token = 'Y+NP8q6nNAK6q3cfTqM9Aw10xZil9KavzqEctWEoS3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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