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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f1e28f2f990974deada19e2bde7d04ffd2aa6d6104e1a4ed41ad60a130f46a' 
  AND token = '8Dd7aQV4IYDwuebHDBCA027dex+dnOtshBwqdcY/sVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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