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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b4ce7412959ffeec5ca0aa7c647a37f717a7dced84b04664f8c8f2ac2be40d' 
  AND token = 'gcYb7Sq9rSNSI98TZUMDitbdu9Lyv/YDUiiqWItT6/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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