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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8fd1db00d0886855cd2d74d59bc4b8086a1f45a68974c19f55f913f8a1edae6' 
  AND token = '/0hzNJsBnJcgOi+lc9EB9WCHDQE1evLqhnFCW7fHytI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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