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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5385479ffbcf2eee97a881b7427e812f6b13d3b9b13219dc446e900afe4a7f' 
  AND token = '5SCkya7Lvma/pN8iA0duu9CxwsOle4b6rUKQITtUUow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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