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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '437e5b8aeb8baeb3ba0e94dafd674ad53da6e43e2fea397181d49f165f54287c' 
  AND token = 'QYG4dwOp3F371NVxpeqKJgX67WfIBqJm9KfgHdnDUvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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