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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '158c1b29ed2e9b96acaade88b9a396f7b309b625699df65f309575c6351be8ad' 
  AND token = '4uJzExwz6pLx5daKf3V09sNDIv+Fny/raoAv+PMoiKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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