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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cbfc90ae70409d55b57533bdd4852b5256239c16f0d259972cda2af8d737586' 
  AND token = 'anNl+OA/kLa4Oq6UGU4XNSs2zyDz4V1Bek1pfJhN3FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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