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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d1fea860e31d75976a958dc1689ee399aac980fa47f7d0316b5d26c478a74c' 
  AND token = 'x2MaB2+7ySo9+IMdV3N3jTqf3tkvn09w0RgAmbB9VIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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