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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc1cc39726efe794d3d1e08c88a7cfd8ad2b7202bad8e2b63138a2b078e17484' 
  AND token = 'TdYndRDw7g8o+ZQJ+Wb9sO4d1mHn5nIDqYLHJWVG0pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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