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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '592e10ba0a304f904adb750b317fb6da2042f661ff12a96a69df43446e85c2df' 
  AND token = 'bOnAnIBAfzm7lmzIYJCqkKbeOCFsBoiSqEXk9P67SdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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