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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086dc5b2690a426bcd44ce987b92a40470ec3fc66020776e52e4c63f8650a892' 
  AND token = '4+p3kb49+DgwytLFfc1uar5NRvbTgewz7mKxzycdMw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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