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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed205bea982b17d680dcda1c1ce68d676effa627bc7f6e649bfdd7daab4096b' 
  AND token = 'dzmA5uMHz6/6D5zXaXfc9+xB3nbjFBTFeS3TPxQE/VI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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