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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac81d84d52dd272e706806fc4b56e840dafda5f7b4268043171669d8bd17b24' 
  AND token = 'vurnPVMrByfbWgvLb0hb4bC8sxK7sgAXp7IbAiEIq3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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