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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff0aac6457e501cc96389f379ee29bc7ef338a7505152b3587501d0dd61634f' 
  AND token = '4xpn1TlmrIXoLZz2dzKLlM7UpH1jAQ2aloOsAtFnxds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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