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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdaf39d8347dd2c8f7b7c26b92f878ae7fafcc90c27e621b51c7d9aa13176e15' 
  AND token = 'ODC99i/SupJqsGxmiI9o5msCj0ePUK/oEWCHuXaYHbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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