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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27ffd2de57bda66dbeeca4104d623cbbe97df946d5244030bf3bc36df4b715c8' 
  AND token = 'rV5YNnMGPklu8o6c50sEmvDmo2pv0Ca7P+vhG085MM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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