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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '446e96b923a4182f61997cc13dbf458cb049ec341345098e0b668ef9ebdbb4be' 
  AND token = '3v07HjMqzZKowF5K0/6/ppnLGiyadmYFcHR4rha4WdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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