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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b79a769c77f568a5d6c67d9ff5ffe15ac1400e4b6951ba57b1cb6a9e84e78f6' 
  AND token = 'olqcs6qS11DUMp5QVW6bz61PP1GkYHtG6fVSg9KVgkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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