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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a635d90e98e6a855084ed2916efe1a4bf026cf070d688f818d6bb01a09ab3fbc' 
  AND token = 'jGwmWZ3kCKcm38xJ5rfOOHRGcOdAouNsGD8ZU9IT87s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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