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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8b63ed168b808399816aba783e85b8f79b8ac9156c29c898c8a45e8b4fae57' 
  AND token = 'Vwg4zNs1mI0lHtKI9haf8Blm4sW0SbfobRREDAuiUTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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