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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd242ad6650a90e39abb6465dd7b0234921a972b3f13e89aef7e036ce6c10f31e' 
  AND token = 'WdajWynLTAV2DATDNF4xxU24DbipwAmBVAAHE4I9pCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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