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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937311cc63881d30f89735f7c0e952504e411482a5ae6ed04eb869823cc9d5ba' 
  AND token = 'WfMHOju5sSXqBotTmpnF/M4ChZV8ar6FoB9Qyz6TpuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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