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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98157f231943eb7a30486703c73fb61be0317f716879326690fc9e702d7cfa5f' 
  AND token = 'rDTOxEPLCR2aWuLLf/52zaPHqe+SKnbrXtmOMgSvEH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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