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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d7ba01728d1599347dea5779261aafbfae09d824f20e013cb7f97459262671b' 
  AND token = 'FOYt/TmU6W9cqshwB6YI1uG+1/mclu0ywI18i67d+Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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