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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a903c9dc156db1314a9ce1aa0283996438c0b5500580cabff020c42365a2dcae' 
  AND token = 'hYKFC7eec5i4cob1Sr21ytO4x6ljIgHiB97CV9eIeKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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