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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '153f9f58f434ad062274d8153620ed7f69b662688512c8a616e8f79e7c2374a6' 
  AND token = 'VDi4Z5UUkevCZTbKxTMnhvRYui3rqad5/yft+7a48k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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