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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be40508afb9f462cc3546975439a75d35a98bef2e1cbfdb7c6e5180294f35c4' 
  AND token = '3oxBWRzpG7uZlZET5Hs42sU0hr39l8opdjP/Vr2fdWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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