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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5359eba68dff8ca2b7f828e000513d635d8c5f913caa512083503116af6b2638' 
  AND token = 'B9gNz6P8KRKZ/wXQJVaQQVc3q6wNasf6oMrXLgxozcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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