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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17347ac255181decc218c20f2b62b3ae627570c566e7123a78b157cc025373d5' 
  AND token = '8swRiKRpzsY3Kyj5Hulr7DCQi00zFE88JM/xjcDPi6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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