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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ac06b82f95725cb54745d4b1283a4c384135661703fb88d24a8aef857d9b09' 
  AND token = 'um4RabEjgS/rpnj7iH6jWEv3C4YxREWU+S2H2vE8epw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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