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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852fbda1a4fdcd5f757360ac07ab144f2bc3ee3ff360fea3c13b935aee73d08f' 
  AND token = 'ELjUtwBcg0oSSj6QkfhK6QQiu+d25sN4hQ3AgVf+STU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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