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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6249b800b16effe3f5c2e8b8c0f87e70ab14a946c0bfb979073b9845491635' 
  AND token = '9hqxtQdRDG7R0Zv1duQBQ/7jm3TAx3r6O1dDHvlr8J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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