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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1306d9db4d9e749d74a66f7b08496cc0edef7114039ba09e87466d20c6c523' 
  AND token = 'w7RCz424+xmKhwB0+g3U5F+M04eiD47E2tXqxBtlYLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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