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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4816477585eb52c6a979aaee09a587cb01e67ad46f5d2792a5bc885b5b9a669b' 
  AND token = 'pGbo92ONRmF+eLYpQzaDNf0wemXEZpMjg7c5g6CvGNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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