SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e6ba06221fd2a53fa987aa701e4749c3b96ddeff8d6cb4cead60c8faf416c25' 
  AND token = 'cq1ZP+sIBE8zXzDbfrsrlKQ/PcupxVLIxzyFCe/vwF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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