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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef415a3f79b29c8166b413b5952c69687acf7e8307409e50077e9e63153967de' 
  AND token = 'A2NtdrfHM6reowXNIeO/TddTGnB6+R1Wpjon2pks9Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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