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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ecf2b86ce9a73dfe213c42a1b94ee1884c4be32331bb12450f7005392545172' 
  AND token = 'Iw90tCx+GZucSGWVmmczXqNN9MdNp2HFYOfD7C7eB2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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