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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e33fddff18fff83833af847cdb561371b88c3e0840e7dcc02fdd39fb119b04' 
  AND token = '3JoHgWUPw5RoiGCPlcd9fddCT5yMr9d3ifxJdhwvacs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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