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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e9813de4e94927b5cbcdbeda382cc19c350bfbe3ef3c5ea9d56ab6ea6d3f677' 
  AND token = 'ChNHdUqmKOKkTd4V19f0pJIOxa+C6tLJOoi79m2ICT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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