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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3165a70c7200d7ca50ba5e84c5ae06d783949485aa94b26c38e365dde4882714' 
  AND token = 'YR5n/M4vG3/QC33o6xfxPiKyfB/iqT37gBrrN3EFrjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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