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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e327b6b39f1c609c609251b41991a6da35b77e5b9e5a96a2df7c5a2fb199ce' 
  AND token = 'KO5aNIZEV/AH4zw8mqwbvW0XGS+Rxshioe/GR+223zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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