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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd083c4499a01e45caf433e77e0fc98722098b3b5312e59c4096690e5cb7d6427' 
  AND token = 'b4w8T/YlQEPhXiq/Zhjy5eJIeIIFwSeyD4KhGoCm9xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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