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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684056f797ea9d8bbc99579e00d8e7c89e823dc16d812a76b10a3ce268b158fd' 
  AND token = 'nUtv7uk5GCyux4hlRqiWj9sxhjiK8ci03j7TPx0FxK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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