SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e370818557bfc697372f3d2f9b22ee59d555cd4d52ed2ce765119ab74403b75' 
  AND token = 'nUKBXPBHvj8Yy4zhV/shCZuXS3Zzimy875R2H2zyVDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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