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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74884dbb07d9288e085bf30d34ee950b425ae582d65db5ce51bb20c95efa6aef' 
  AND token = 'GsLBA2jQ+5DrSQRLwFf9aK9ICoyWmXDfOMby2rTVjZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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