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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ef3de7997b67325a56a04a058e499edad49c98ce5694ba935f1226fa79498ce' 
  AND token = 'pCjnGCLYr9VhB/n2IxtnxOyOn/zZ/EI3+7x0Z9m/zMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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