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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ca6cc47cdbf8093daa6829a976830a6232a9703eb460c5e1ccf1cce14e34df' 
  AND token = '06NabpdWX3l63KWUvcJq6vefixKQYr/UvHCx0CFitRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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