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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd029bc6cb26af164c5ab996752cc9807aa3cbc8cb84f65bcd72b5dcdf823959' 
  AND token = '2tDlchxYLfwM+vC1KbqTu1f1HvVn5F/h8giH8Wgbegk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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