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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62f4b9bdcc1ab914ed0ae911839e6f65f3665606676ab473bc06171a8717bc7' 
  AND token = 'h6Jszd+zAy1pFTM5zdjWSS+0Z5Fq6KGa9Awc6B2jS3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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