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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '663e563bd23e4635d2af5dee52bc5e9f0825be9402de5f89bcc970a294f782bd' 
  AND token = '4iP5uuHrDS0kxWv0z7zn+ibIWNB3qoVeGsbEDRWcWHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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