SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad0542889a705fce85b362242fe13ae0d30e5a966157375698551881e92c429' 
  AND token = 'fGvpvjV08sjztGA9YCAmB0/ig6JrqbCMu485Q6QKXbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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