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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3886f16c394f444c8502296497292af9c35ea00ea22c6a921467b364716055ad' 
  AND token = 'r8HNl8Vc0zKJzNLGh64ztmrHqlPWuO4DnPET6UpWNcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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