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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcff628c0316e9276c0dde44ba00fd84766621104e122ff532338349a5daa7da' 
  AND token = 'fsBxjm/2yiic1TFvU2Qs2oMEJByo3srJH5JhIRmR2/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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