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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ae216962a0d0ebb9a6e5f01915572c66e0de2f34df23e3456df8c9f85fa588' 
  AND token = 'PJ9LJSuXiRmn0ow5HEYAP3gZSgkNT1decUY/CiTwZlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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