SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8dfb5236f5fbaf45f04de88e237c80f1117c9602522c27b8bfbe2266dfeb9e' 
  AND token = 'baliJ4MYFv+znzILXnp5zGq7Prw9HT/I/mQmaLMYYtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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