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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef1bc30b21e8c2bea850ad45f84f42471260f7477e5ff03e9d5cbfad8302af55' 
  AND token = '+PAOHCt9FjNZOhDCvQve1fwjw39jyF6o+whRAiKIa4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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