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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd23d1d852dd1abb31f8a735757aed1fdfc8828ef131670baf825387572874f' 
  AND token = 'KS0LJrh1C9Jtj1cFB25uU29oz4jMtSFZgHCmMUdwoLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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