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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '271b4af2735cc82c013836c2b3e9aa30572561091f86711cdca93a8f696e706f' 
  AND token = '1kETyfYzCT0UY1vWIxeZyiseCfFaT+6cS90yqSDz04w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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