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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd05183f02823f366e54ca1e3efc68b3bcf6ef847e8e37a195f2d6b65af13e29' 
  AND token = '+Tqz9KEN8VnWJq2zPq8WBbIi/nxqUPjrSkjgy0obBlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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