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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dcaa6302bda9a1b5be9d2fc16ebf668b78279c7dd0408bc37bdda0edf424dcb' 
  AND token = '191RYXtbFsqKqHUI73g0GlLCRwxeLLlpA9RM4LgCXhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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